From: Christoph Hellwig <hch@lst.de>
To: "David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>
Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
Steffen Klassert <steffen.klassert@secunet.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 1/9] ipv4: streamline ipmr_new_tunnel
Date: Tue, 19 May 2020 15:03:11 +0200 [thread overview]
Message-ID: <20200519130319.1464195-2-hch@lst.de> (raw)
In-Reply-To: <20200519130319.1464195-1-hch@lst.de>
Reduce a few level of indentation to simplify the function.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
net/ipv4/ipmr.c | 73 ++++++++++++++++++++++++-------------------------
1 file changed, 36 insertions(+), 37 deletions(-)
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 5c218db2dede7..a1169b6941134 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -471,50 +471,49 @@ static bool ipmr_init_vif_indev(const struct net_device *dev)
static struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v)
{
- struct net_device *dev;
+ struct net_device *tunnel_dev, *new_dev;
+ struct ip_tunnel_parm p = { };
+ mm_segment_t oldfs = get_fs();
+ struct ifreq ifr;
+ int err;
- dev = __dev_get_by_name(net, "tunl0");
+ tunnel_dev = __dev_get_by_name(net, "tunl0");
+ if (!tunnel_dev)
+ goto out;
- if (dev) {
- const struct net_device_ops *ops = dev->netdev_ops;
- int err;
- struct ifreq ifr;
- struct ip_tunnel_parm p;
+ p.iph.daddr = v->vifc_rmt_addr.s_addr;
+ p.iph.saddr = v->vifc_lcl_addr.s_addr;
+ p.iph.version = 4;
+ p.iph.ihl = 5;
+ p.iph.protocol = IPPROTO_IPIP;
+ sprintf(p.name, "dvmrp%d", v->vifc_vifi);
+ ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
- memset(&p, 0, sizeof(p));
- p.iph.daddr = v->vifc_rmt_addr.s_addr;
- p.iph.saddr = v->vifc_lcl_addr.s_addr;
- p.iph.version = 4;
- p.iph.ihl = 5;
- p.iph.protocol = IPPROTO_IPIP;
- sprintf(p.name, "dvmrp%d", v->vifc_vifi);
- ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
+ if (!tunnel_dev->netdev_ops->ndo_do_ioctl)
+ goto out;
- if (ops->ndo_do_ioctl) {
- mm_segment_t oldfs = get_fs();
+ set_fs(KERNEL_DS);
+ err = tunnel_dev->netdev_ops->ndo_do_ioctl(tunnel_dev, &ifr,
+ SIOCADDTUNNEL);
+ set_fs(oldfs);
+ if (err)
+ goto out;
- set_fs(KERNEL_DS);
- err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
- set_fs(oldfs);
- } else {
- err = -EOPNOTSUPP;
- }
- dev = NULL;
+ new_dev = __dev_get_by_name(net, p.name);
+ if (!new_dev)
+ goto out;
- if (err == 0 &&
- (dev = __dev_get_by_name(net, p.name)) != NULL) {
- dev->flags |= IFF_MULTICAST;
- if (!ipmr_init_vif_indev(dev))
- goto failure;
- if (dev_open(dev, NULL))
- goto failure;
- dev_hold(dev);
- }
- }
- return dev;
+ new_dev->flags |= IFF_MULTICAST;
+ if (!ipmr_init_vif_indev(new_dev))
+ goto out_unregister;
+ if (dev_open(new_dev, NULL))
+ goto out_unregister;
+ dev_hold(new_dev);
+ return new_dev;
-failure:
- unregister_netdevice(dev);
+out_unregister:
+ unregister_netdevice(new_dev);
+out:
return NULL;
}
--
2.26.2
next prev parent reply other threads:[~2020-05-19 13:04 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-19 13:03 add a new ->ndo_tunnel_ctl method to avoid a few set_fs calls v2 Christoph Hellwig
2020-05-19 13:03 ` Christoph Hellwig [this message]
2020-05-19 13:03 ` [PATCH 2/9] ipv4: consolidate the VIFF_TUNNEL handling in ipmr_new_tunnel Christoph Hellwig
2020-05-19 13:03 ` [PATCH 3/9] net: add a new ndo_tunnel_ioctl method Christoph Hellwig
2020-05-19 13:03 ` [PATCH 4/9] impr: use ->ndo_tunnel_ctl in ipmr_new_tunnel Christoph Hellwig
2020-05-19 13:03 ` [PATCH 5/9] sit: refactor ipip6_tunnel_ioctl Christoph Hellwig
2020-05-19 13:03 ` [PATCH 6/9] sit: impement ->ndo_tunnel_ctl Christoph Hellwig
2020-05-19 13:03 ` [PATCH 7/9] ipv6: stub out even more of addrconf_set_dstaddr if SIT is disabled Christoph Hellwig
2020-05-19 13:03 ` [PATCH 8/9] ipv6: streamline addrconf_set_dstaddr Christoph Hellwig
2020-05-19 13:03 ` [PATCH 9/9] ipv6: use ->ndo_tunnel_ctl in addrconf_set_dstaddr Christoph Hellwig
2020-05-19 22:45 ` add a new ->ndo_tunnel_ctl method to avoid a few set_fs calls v2 David Miller
-- strict thread matches above, loose matches on Subject: below --
2020-05-18 11:46 add a new ->ndo_tunnel_ctl method to avoid a few set_fs calls Christoph Hellwig
2020-05-18 11:46 ` [PATCH 1/9] ipv4: streamline ipmr_new_tunnel Christoph Hellwig
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